Solo and Kuryakin investigate a Scottish town where everyone has mysteriously died of old age in a matter of hours. Their findings lead Solo to Norway in search of the source of the chemical causing the premature aging. While waiting in the airport in London for his flight to Norway, Solo meets Christopher Larson, who fancies Solo as a new husband for his widowed mother back in New York. Larson becomes attached to Solo and follows him to Norway, where the two of them combat the evil General Yokura, who is behind the plot to develop the aging chemical.